ASP.NET Tutorial/Configuration/New Section

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Creating a Configuration Element Collection

File: App_Code\ShoppingCartSection.cs
using System;
using System.Configuration;
namespace MyNamespace
{
    public class ShoppingCartSection : ConfigurationSection
    {
        [ConfigurationProperty("maximumItems", DefaultValue = 100, IsRequired = true)]
        public int MaximumItems
        {
            get { return (int)this["maximumItems"]; }
            set { this["maximumItems"] = value; }
        }
        [ConfigurationProperty("defaultProvider")]
        public string DefaultProvider
        {
            get { return (string)this["defaultProvider"]; }
            set { this["defaultProvider"] = value; }
        }
        [ConfigurationProperty("providers", IsDefaultCollection = false)]
        public ProviderSettingsCollection Providers
        {
            get { return (ProviderSettingsCollection)this["providers"]; }
        }
        public ShoppingCartSection(int maximumItems, string defaultProvider)
        {
            this.MaximumItems = maximumItems;
            this.DefaultProvider = defaultProvider;
        }
    }
}
File: Web.config
<configuration>
  <configSections>
    <sectionGroup name="system.web">
      <section
        name="shoppingCart"
        type="MyNamespace.ShoppingCartSection"
        allowLocation="true"
        allowDefinition="Everywhere" />
    </sectionGroup>
</configSections>
<system.web>
  <shoppingCart
    maximumItems="50"
    defaultProvider="SqlShoppingCartProvider">
    <providers>
      <add
        name="SqlShoppingCartProvider"
        type="MyNamespace.SqlShoppingCartProvider" />
      <add
        name="XmlShoppingCartProvider"
        type="MyNamespace.XmlShoppingCartProvider" />
    </providers>
  </shoppingCart>
</system.web>
</configuration>


Creating Custom Configuration Sections by inheriting a new class from ConfigurationSection class

File: App_Code\DesignSection.cs
using System;
using System.Configuration;
using System.Drawing;
namespace MyNamespace
{
    public class DesignSection : ConfigurationSection
    {
        [ConfigurationProperty("backcolor", DefaultValue = "lightblue", IsRequired = true)]
        public Color BackColor
        {            get { return (Color)this["backcolor"]; }
            set { this["backcolor"] = value; }
        }
        [ConfigurationProperty("styleSheetUrl", DefaultValue = "~/styles/style.css", IsRequired = true)]
        [RegexStringValidator(".css$")]
        public string StyleSheetUrl
        {
            get { return (string)this["styleSheetUrl"]; }
            set { this["styleSheetUrl"] = value; }
        }
        public DesignSection(Color backcolor, string styleSheetUrl)
        {
            this.BackColor = backcolor;
            this.StyleSheetUrl = styleSheetUrl;
        }
        public DesignSection()
        {
        }
    }
}
Register it in a configuration file. 
File: Web.config
<configuration>
  <configSections>
    <sectionGroup name="system.web">
    <section
        name="design"
        type="MyNamespace.DesignSection"
        allowLocation="true"
        allowDefinition="Everywhere"/>
    </sectionGroup>
  </configSections>
  <system.web>
    <design
      backcolor="red"
      styleSheetUrl="~/styles/style.css"/>
  </system.web>
</configuration>


Using the custom configuration section to modify the page style and background color.

<%@ Page Language="C#" %>
<%@ Import Namespace="MyNamespace" %>
<%@ Import Namespace="System.Web.Configuration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load()
    {
        DesignSection section = (DesignSection)WebConfigurationManager. GetWebApplicationSection("system.web/design");
        htmlBody.Attributes["bgcolor"] = System.Drawing.ColorTranslator.ToHtml (section.BackColor);
        HtmlLink link = new HtmlLink();
        link.Href = section.StyleSheetUrl;
        link.Attributes.Add("rel", "stylesheet");
        link.Attributes.Add("type", "text/css");
        Page.Header.Controls.Add(link);
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Design Section</title>
</head>
<body id="htmlBody" runat="server">
    <form id="form1" runat="server">
    <div>
    <h1>Custom Configuration Section Sample</h1>
    </div>
    </form>
</body>
</html>
File: Web.config
<configuration>
  <configSections>
    <sectionGroup name="system.web">
    <section
        name="design"
        type="MyNamespace.DesignSection"
        allowLocation="true"
        allowDefinition="Everywhere"/>
    </sectionGroup>
  </configSections>
  <system.web>
    <design
      backcolor="red"
      styleSheetUrl="~/styles/style.css"/>
  </system.web>
</configuration>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Configuration/New_Section&oldid=2836»